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Made in 1957.
Your Winchester model 70 featherweight was made by Winchester in 1955.The value of pre-64 featherweight,s are ranging between 800-1200 dollars if the wood stock is in original condition with varnish and checkering in good shape and the metal blueing remaining in 90% coverage on the metal.
50-1000 usd
your 770 is worth about $250..00 to $300.00 hope this helps
No such model number
The 243 Winchester caliber was introduced in the model 70 bolt action and the model 88 lever action rifles in the year 1955 by Winchester.
The twist rate in a Winchester 670, 243 caliber is 1:10.
Most sell for between 350-500 dollars,depending on overall condition.
275-500 dollars depending on overall condition,and a good bore.
100-1000 USD depending on specifics
100-10000 USD